So I would like to know if someone has an answer to this, Im running a 99 5.3 with 241 stock heads & ls9 gaskets, what should my compression be?
Thanks in advance.

 

google what ever your factory compression is... its slightly lower than that...

 

I believe stock is 9:5 to 1, so the 241s & thicker gaskets will make a difference, but Im not sure how much lower it is

 

My calculation came up with 8.9:1 comp.

 

Thicker gaskets?????? The 1999 LM7 has .058" gaskets factory that's compressed btw. Go to "Wallace Racing" and check out all the engine and performance, gear ratio change static n dynamic CR calculators camshaft icl,,,,blah blah blah .